Hoisting mechanism



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Patented Sept. 8, 1931 UNITED STATES PATENT OFFICE HOWARD G. MCILVR-IED, F GARY, INDIANA, ASSIGNOR 'IO AMERICAN SHEET AND TIN PLATE COMPANY, A CORPORATION OF NEW JERSEY H OISTING MECHANISM Application filed April 14,

This invention relates to hoisting mechanism and is particularly applicable for the lifting of annealing boxes, box-stands or the like.

It is amon the objects of this invention to provide 3.7101513 mechanism in which the work-engaging members or hooks are adapted to either engage the projections on the annealing boxes or other articles to be hoisted, or to project into recesses or slotted portions of such articles.

Another object of the invention is to provide a hoist mechanism in which the hooks for gripping the work are motor operated through a suitable gear and clutch mechanism. 1

These and other objects of the invention will become more apparent from a consideration of the accompanying drawings in which- Figure 1 is a front elevational View of a hoist mechanism embodying the principles of this invention. v

Figure 2 is a top plan thereof.

Figure 3 is a partial view of the hook operating mechanism in cross-section.

Figures 4 and 5 are side and front elevational views, respectively, ofa special hook applicable for use in the hoist shown in Figure 1.

Figures 6 and 7 are similar views of a modified form of hook.

Figures 8 and 9 are views in elevation showing the manner of attaching the hooks to the annealing box or box-stand.

Vith reference to Figs. 1 to 3 of the drawings, the reference character 1 designates a pair of channel members constituting a transverse support on which a plurality of hooks 2 are supported. The channels 1 are connected by brackets 3 each of which houses a shaft 4 to which the hooks 2 are secured by keys 5. The brackets 3 further house a. worm shaft 6 and a segment gear 7, the latter being mounted for movement with the hook-operating shafts 4. The worm shaft 6 is connected through a flanged coupling 8 with a clutch mechanism generally designated at 9, one side of which is operatively connected 1930. Serial No. 444,304.

through a gear wheel 10 with a drive motor 11 shown in dotted lines in Fig. 1'.

The clutch mechanism comprises an annl1- lus having a radial flange 12 that cooperates with a pair of friction disks 13 and lwhich are yieldingly urged in engagement with flange 12 by coil sprin s 15 mounted on a plurality of through bo ts 16. The friction disks may be lined with asbestos composition or other suitable engaging material 17.

The clutch mechanism is designed to provide constant operative relation of the worm shaft 6 with the drive motor 11 by constant engagement of the friction disks, and when the hooks 2 are in engagement with the article to be hoisted, the clutch mechanism is adapted to slip, thus preventing damage to the operating mechanism.

The movement of the pair of hooks 2 is coordinated through a gear drive comprising a gear wheel which is operative with the clutch mechanism, a gear wheel 21 with which it meshes, and the gear wheels 22 and 23, which are respectively mounted on a countershaft 24 and drive shaft 25. With this connection the single clutch mechanism 9 is operative to permit the operation of the drive motor 11, while both of the hook mem bers are in abutment with the article to be hoisted. The electric control of the motor 11 can be effected in a well known manner by the use of switches located for the operators convenience.

In the operation of the hoist mechanism, the motor 11 is energized and is operative in either direction of rotation to subject the shafts 4 to angular movement through its associated gear mechanism, namely the worm shaft 6 and the segment gear 7 hen the hooks 2 have reached either their work-engaging or-releasing positions, the motor is de energized, or in any event, the clutch mechanism will prevent injury to the parts of the drive mechanism.

The hooks 2 are shown in detail in the remaining figures of the drawings. The hooks 2 are arranged in pairs on the shafts 4 at each end of the supporting frame and are composed of bars having their lower ends turned over to form hook portions 27. The hook members of each pair are connected by a cross member or tie-bar 28 which is secured to the hook members 2 in any suitable manner, as by welding at 29, to rigidly hold the books of the pair in spaced relation. The cross member 28 may be of any suitable cross-section.

The hooks 2 of each pair of hooks are provided with bearing lugs 30 in which a shaft 31 is journaled. A third hook member 33 is mountedon the shaft 31 between the hooks 2 of each pair of books and is of a width to substantially fill the space between the books of the pair of books. is secured to the shaft 31 by a cotter-pin 34 or other suitable means and has its lower end bent at substantially right angles to form a hook flange 33 which, when the hook 33 is in norma position, has its upper face in substantial alinement with the upper faces of the hook portions 27 of the hooks 2.

The.hooks 33 are provided with loops or straps 35 which are disposed around the transverse tie-bars 28 to limit the movement of the hooks 33 relative to the pairs of hooks 2. The hooks 33 are normally urged inwardly toward the workpiece by spring-operated plungers 36 which are mounted in housings 37 secured to the transverse tie-bars 28 as by welding at-38. The plungers 36 are disposed in the housings and are provided with a shoulder 39 forming a seat for a spring 40 which is retained in the housing by a cap 41.

In Figures 6 and 7 the spring-operated plungers are eliminated and the hooks 33 are provided with a counter-weight 43 which is a portion of a U-shaped member 44 that is secured tot-he hook 33 and is disposed around a: cross member 45 which ties the books 2 of each pair together. The member 44 serves to limit the movement of the hook 33 and also, due to its weight, serves as a counterweight.

In Figure 8 the hooks 2 and 33 are shown in their normal position for lifting an annealing box cover and in this operation portions 27 of the hooks 2 and portions 33 of the hooks 33 make full contact along the lower face of a rib or ledge 47 of the box cover.

In Figure 9 the hooks 2 are shown in lifting engagement with an annealing box base or bottom 49. During this operation the hook portions 27 of the hooks 2 project into the grooves of the base 49 and the hooks 33 are retracted in the manner shown due to interference with the sides of the base. \Vhen the books 2 are disengaged from the base 49 the hooks will assume their normal position by means of the spring-pressed plungers 36 or the counter-weights 43, both previously described.

The use of the books 33 in combination with the hooks 2 is especially advantageous when handling annealing box covers since the combined hooks provide a substantially contin- The hook member 33 nous supporting surface along substantially the entire length of the rib or ledge 47 and eliminate the danger of the covers slipping 03 of the hooks, such as is the case when separate hooks like the hooks 2 are used alone.

Although several embodiments of the invention have been herein illustrated and described, it will be obvious to those skilled in the art that various modifications may be made in the details of construction without departing from the principles herein set forth.

I claim 1. In a hoist having opposed jaw members, a jaw member comprising spaced hook members, means for swingingsaid hook members about a horizontal axis to engage one side of a work-piece, a third hook member hingedly supported between said pair of hook members for movement relative to said hook members, means for normallyyieldably urging" said third hook member inwardly toward the work-piece, and means for limiting the movement of said third book member relatively to said pair of hook members.

2. In a hoist having opposed jaw members, a jaw member comprising spaced hook members, means for swinging sa1d hook members about a horizontal axis to engage one side of a work-piece, a third hook member hingedly supported and substantially filling the space between said pair of hook members, said third hook member being movable with and relative to said pair of hook members, means for normally urging said third book member inwardly toward the work-piece, and means for limiting the movement of said third hook {member relative to said pair of book memers.

3. In a hoist having opposed jaw members,

a jaw member comprising spaced hook members, means for swinging said hook members about a horizontal axis to engage one side of a work-piece, a third book member hingedly supported and substantially filling the space between said pair of hook mem-' bers, said third hook member being movable with and relative to said pair of hook members, a tie-bar extending between said pair of hook members for tying said hook members together, at least one spring-pressed lunger carried by said bar and engaging t e rear face of said third hook member for normallyurging said third hook member inwardly toward the work-piece, and means carried by said-third hook member and cooperating with said tie-bar for limiting the movement of said third hook member relative to said pair of hook members.

4. In a hoist having opposed aw members, a j aw member comprising spaced hook members, means for swinging said hook members about a horizontal axis to engage one side OI a work-piece, a third hook member hingedly supported and substantially filling the space between said pair of hook members said third hook member being movable with and relative to said pair of hook members, a tiebar extending between said pair of hook members for tying said hook members together, and means carried by said third hook member and cooperating with said tie-bar for limiting the movement of said third hook member relative to said pair of hook members. i

5. A hoisting mechanism comprising a supporting frame, a pair of shafts journaled in said frame, each of said shafts having a pair of spaced hooks bars keyed thereto and depending therefrom, means for rocking said shafts to swing said pairs of hook bars toward and away from each other to engage and release a work-piece, each of said pairs of hook bars bein provided with a shaft 'ournaled in suitab e bearings in the hook ars, a third hook member mounted on said last named shaft and substantially filling the space between said pair of hook bars, and means for normally yieldably urging said third hook member inwardly toward the work-piece.

In testimony whereof, I have hereunto set my hand. HOWARD G. MGILVRIED. 

